Keeping columns fixed.

[User (Old forums)]

#12936 |

In my Grid 1.1 app I implemented a keep first n columns fixed feature. I used the faq as a starting point. It worked in grid 1.1. After upgrading to grid 2.0 I get an exception: <b><i>An attempt was made to update the PaintManager while it is already updating.</i></b>

I made a little sample program/form having 1 gridcontrol <b>gridControl1</b> and one checkbox <b>checkBox1</b>. If the checkbox is checked, the first 5 columns are kept fixed.

Sample code:
Create a winform project, in the form draw a grid gridControl1 and a checkbox checkBox1.
Replace the form code by:
<hr>

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace xceedbug
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.CheckBox checkBox1;
private Xceed.Grid.GridControl gridControl1;
private Xceed.Grid.GroupByRow groupByRow1;
private Xceed.Grid.ColumnManagerRow columnManagerRow1;
private Xceed.Grid.DataRow dataRowTemplate1;

private string[][] data;
private int nFixedColumns;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support – do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.checkBox1 = new System.Windows.Forms.CheckBox();
this.gridControl1 = new Xceed.Grid.GridControl();
this.groupByRow1 = new Xceed.Grid.GroupByRow();
this.columnManagerRow1 = new Xceed.Grid.ColumnManagerRow();
this.dataRowTemplate1 = new Xceed.Grid.DataRow();
((System.ComponentModel.ISupportInitialize)(this.gridControl1)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.columnManagerRow1)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.dataRowTemplate1)).BeginInit();
this.SuspendLayout();
//
// checkBox1
//
this.checkBox1.Location = new System.Drawing.Point(16, 232);
this.checkBox1.Name = “checkBox1”;
this.checkBox1.Size = new System.Drawing.Size(136, 24);
this.checkBox1.TabIndex = 0;
this.checkBox1.Text = “keep 5 columns fixed”;
//
// gridControl1
//
this.gridControl1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.gridControl1.DataRowTemplate = this.dataRowTemplate1;
this.gridControl1.FixedHeaderRows.Add(this.groupByRow1);
this.gridControl1.FixedHeaderRows.Add(this.columnManagerRow1);
this.gridControl1.Location = new System.Drawing.Point(16, 8);
this.gridControl1.Name = “gridControl1”;
this.gridControl1.Size = new System.Drawing.Size(568, 224);
this.gridControl1.TabIndex = 1;
this.gridControl1.FirstVisibleColumnChanged += new System.EventHandler(this.gridControl1_FirstVisibleColumnChanged);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(592, 270);
this.Controls.Add(this.gridControl1);
this.Controls.Add(this.checkBox1);
this.Name = “Form1”;
this.Text = “Form1”;
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.gridControl1)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.columnManagerRow1)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.dataRowTemplate1)).EndInit();
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Xceed.Grid.Licenser.LicenseKey = “SAMPLE-APPLICATION-KEY”;
Application.Run(new Form1());
}

private void Form1_Load(object sender, System.EventArgs e)
{
nFixedColumns = 5;
data = new string[20][];
for (int i = 0 ; i < data.GetLength(0); i++)
{
data[i] = new string[30];
for (int j = 0; j < data[i].GetLength(0); j++)
{
data[i][j] = j.ToString();
}
}
gridControl1.DataSource = data;
}

private void gridControl1_FirstVisibleColumnChanged(object sender, System.EventArgs e)
{
if (this.checkBox1.Checked)
{
//The nFixedColumns int contains the number of columns that should fixed.
//n means the n first columns need to be on screen always.
//columns are named “0” “1” “2” … initially.
int nTel = 0;
int nFilPos;
if (gridControl1.FirstVisibleColumn != null)
{
nTel = gridControl1.FirstVisibleColumn.VisibleIndex;
//We known the name of the first column is “0”.
// This column should be made visible again
// as should column “1”, “2” etc up to nFixedColumns
nFilPos = gridControl1.Columns[“0”].VisibleIndex;
//if the position of what should be visible is less than the first
//visible column…
if (nFilPos < nTel)
{

Imported from legacy forums. Posted by marc (had 3205 views)

[User (Old forums)]

#12937

Same issue here..I get the same error: An attempt was made to update the PaintManager while it is already updating.

Imported from legacy forums. Posted by Papo (had 268 views)

[User (Old forums)]

#12938

I used to get that problem a lot. You arent calling that from a thread other than the main thread are you? I have a program where I am constantly updating the grid, and if it isnt done in a form timer, i get that error all day long.

I thought I had a fix to keeping the columns in order

While superTrim(MainGrid.FirstVisibleColumn.Title) <> “score”
MainGrid.Columns(“col1”).VisibleIndex = MainGrid.FirstVisibleColumn.VisibleIndex
MainGrid.Columns(“col2”).VisibleIndex = MainGrid.FirstVisibleColumn.VisibleIndex + 1
MainGrid.Columns(“col3”).VisibleIndex = MainGrid.FirstVisibleColumn.VisibleIndex + 2
MainGrid.Columns(“col4”).VisibleIndex = MainGrid.FirstVisibleColumn.VisibleIndex + 3
MainGrid.Columns(“col5”).VisibleIndex = MainGrid.FirstVisibleColumn.VisibleIndex + 4
End While

but now it is freezing on certain computers…

Imported from legacy forums. Posted by Mike (had 3545 views)

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